20. If from the angle of elevation from the ground to the top of a cliff...

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20. If from the angle of elevation from the ground to the top of a cliff is 45° from 100 feet away, how tall is the cliff? 21. An observer in an air traffic control tower sees a plane taxiing between runways. If the tower is 390 feet tall, and the angle of depression from the observer to the plane is 15°, how far away is the plane from the observation deck? from the base of the tower? 20. If from the angle of elevation from the ground to the top of a cliff is 45° from 100 feet away, how tall is the cliff? 21. An observer in an air traffic control tower sees a plane taxiing between runways. If the tower is 390 feet tall, and the angle of depression from the observer to the plane is 15°, how far away is the plane from the observation deck? from the base of the tower?